docs: def proxy_urls_from_dns(local_hostname=None):
      """
      Generate URLs from which to look for a PAC file, based on a hostname.
      Fully-qualified hostnames are checked against the Mozilla Public Suffix List to ensure that
      generated URLs don't go outside the scope of the organization.
      If the fully-qualified hostname doesn't have a recognized TLD,
      such as in the case of intranets with '.local' or '.internal',
      the TLD is assumed to be the part following the rightmost dot.
  
      :param str local_hostname: Hostname to use for generating the WPAD URLs.
          If not provided, the local hostname is used.
      :return: PAC URLs to try in order, according to the WPAD protocol.
          If the hostname isn't qualified or is otherwise invalid, an empty list is returned.
      :rtype: list[str]
      """
      if not local_hostname:
          local_hostname = socket.getfqdn()
      if '.' not in local_hostname or len(local_hostname) < 3 or \
              local_hostname.startswith('.') or local_hostname.endswith('.'):
          return []
      try:
          parsed = get_tld('http://' + local_hostname, as_object=True)
          subdomain, tld = parsed.subdomain, parsed.fld
      except TldDomainNotFound:
          final_dot_index = local_hostname.rfind('.')
          subdomain, tld = local_hostname[0:final_dot_index], local_hostname[final_dot_index+1:]
      return wpad_search_urls(subdomain, tld)